Fill out the form below. Please be sure to include the URL where you found the lower priced item as well as any other information in the notes.

2

When finished filling out the form, click "Continue". You will be returned to the product page with the price of the item matched.

3

Checkout as you normally would. Once your order is placed our Customer Relations team will review your order and contact you if necessary.

Price *:

URL *:

Notes:

The Fine Print:
We reserve the right to validate all price matches. Total price matched is the absolute total including shipping. Clearance product is excluded.
No promotions can be combined with any price matched item. This offer/guarantee may stop at any time without notice.

What's Inside:

*Please Note: Both colors and patterns are for general reference only. Colors may vary from computer to computer.

Forgot Password

Please enter your email address to have your password emailed to you. Should you not know your email address please contact us
at 888-828-3828 (We are not able to help with passwords as we cannot retrieve them).

Please Confirm

Share a Photo

Don't worry if you don't have a photo to share right now?
You can come back anytime and add your photo in the Customer Photos section.

Something Unexpected Occurred...

ACK Review:
If you want to go faster in your kayak then this is the way to do it. The hobie mirage system was a great idea. This made it even better. Increase your speed with this simple turbo fin kit.

Customer Rating: 4.8 of 5

Customer Reviews

Reviewer:

DF

Rating:

5

Date:

4/30/2012

Review:

ACK was very easy to deal
with. If you dont have the
turbo fins you need to get
them. I cant really figure out
why Hobie doesnt make these
standard. If you want easier
pedaling just pedal easy. The
kayak will still go faster
than with the same effort with
standard fins.

Reviewer:

skunk factory

Rating:

5

Date:

3/30/2012

Review:

my old fins were a little bent
and chewed up. replacing them
made a big difference. easy
install

Reviewer:

scubadiver400

Rating:

5

Date:

1/14/2012

Review:

They definitely make your
Kayak move a lot faster than
the regular fins. It's
definitely a huge plus and if
you add the Larger rudder, you
will have a lot more control
of your kayak.

Reviewer:

Terry McClain

Rating:

5

Date:

9/17/2011

Review:

I must if you have a Hobie
Adventure with the
standard fins. Huge increase
in speed and distance.
Add a larger rudder to your
order and the
combination for the Adventure
makes a noticeable
difference in the performance
of the model.

Reviewer:

Gtron3030

Rating:

5

Date:

8/26/2011

Review:

impressive increase in speed.

Reviewer:

Tonyb

Rating:

5

Date:

7/29/2011

Review:

This is a great performance
enhancer and easy to install.

Reviewer:

MJZ

Rating:

4

Date:

7/28/2011

Review:

Great improvment in speed and
response.
Great marketing on Hobies
part. Way overpriced.
They have a nich and they are
taking advantage.
This upgrade along with the
larger rudder has improved
sailing performance greatly.

Reviewer:

RobertD

Rating:

5

Date:

7/13/2011

Review:

The turbo fin is really easy to
replace. Just unhook the pin and
slip the new one one. ACK is
great with customer service and
shipping is fast.

Reviewer:

Gary F

Rating:

5

Date:

5/4/2011

Review:

Wow! What a performance improvement. Easy to install and worth the price. No regrets here only smiles and miles.

Reviewer:

nstarjavman

Rating:

5

Date:

4/25/2011

Review:

Easy install, provide good power, easily held 4.5
knots into a 30 knot headwind using these fins.

Reviewer:

atch71

Rating:

5

Date:

2/13/2011

Review:

Needed a spare set. Nobody in my area, including my Hobie dealer carries much stock. ACK had it and shipped it right away. Plus, "Cali" got screwed out of their stinkin' tax! I win! ACK wins!

Reviewer:

Julie

Rating:

5

Date:

2/3/2011

Review:

This was easy to put on, and wonderful difference in use. I'm a small woman and was worried about the additional energy output, but it is hardly noticed for a nice difference in speed. Highly recommended!

Customer Reviews

Reviewer:

ShaneC

Rating:

5

Date:

7/3/2014

Review:

Great upgrade, I did my
outback first then my wife
decided she needed a pair.
She didn't like getting beat.
These will allow us to explore
more with less effort. Next will
be the rudder. I had to replace
a sprocket because I could not
remove the shaft. Easy to do
and Hobie parts are very
reasonably priced. Great
company.

Reviewer:

brlaub

Rating:

5

Date:

5/16/2014

Review:

Great upgrade for my Outback.
More speed with the same effort.
Hobie should make them
standard equipment.

Reviewer:

Isaac

Rating:

5

Date:

3/30/2014

Review:

Great upgrade. Easy install if
you follow the instruction.
Makes a noticeable difference
not only in speed and power
but slows the peddling cadence
required to maintain the same
pace. I also recommend the
sailing rudder upgrade to go
along with these fins.

Reviewer:

JayW

Rating:

5

Date:

3/24/2014

Review:

Great upgrade to the standard
Mirage Drive. Easy to install
and makes a huge difference
in the function of your Hobie!
Love it, should have upgraded
my drive sooner!! Hardest part
was removing the old rods.
install was easy after that!

Reviewer:

Eddiemac

Rating:

5

Date:

12/15/2013

Review:

Great product, easy install as you
would expect from Hobie and
good price and fast service as you
would expect from ACK.

Reviewer:

tom sorg

Rating:

5

Date:

10/1/2013

Review:

great item. you can really tell the
difference. eazy to swap out.

Reviewer:

Ken

Rating:

5

Date:

9/23/2013

Review:

I had a pair already and wanted
another to replace our 'slower'
version and love them!! Thank
you!!

Reviewer:

Works Well

Rating:

5

Date:

9/18/2013

Review:

These were easy to install and
they do move a lot more water
and increase your overall
speed. Plus the adjustable
tensioner allows you to control
the amount of resistance and
speed you desire.

Reviewer:

etolentino13

Rating:

5

Date:

8/29/2013

Review:

Switched over from standard fins
to the turbo fins and am very
happy with them. Totally worth
every penny. Thanks ACK!!

Reviewer:

Nik

Rating:

5

Date:

8/29/2013

Review:

Well worth the money. They
made a huge difference when I
was out in the Gulf of Mexico.

Reviewer:

SP

Rating:

5

Date:

6/24/2013

Review:

Quick, easy installation. I
noticed a small difference in
initial exertion, but a huge
difference in speed. After a few
times out my legs gained
enough strength and I no
longer feel the extra
resistance. Great product.

Reviewer:

Jeremy

Rating:

5

Date:

6/20/2013

Review:

More power to you... literally.

Reviewer:

Kayak

Rating:

5

Date:

4/15/2013

Review:

I love the added resistance and speed.
Relating it to riding a bike, I felt the
standard fins were in too low of a gear. I
now get more out of each stoke, and a
better leg workout.

Reviewer:

Kayaking is fun

Rating:

5

Date:

4/15/2013

Review:

AWESOME PRODUCT!!! super
easy to glide quickly and easily
through the water. Much faster
than regular fin. Would
recommend!!

Reviewer:

mik

Rating:

5

Date:

11/23/2012

Review:

Nice upgrade over the
standard equipment. Even at
maximum torque setting I find
them easy to pedal. It makes
kayaking against river currents
and tides more controllable.

Reviewer:

Kevin C

Rating:

5

Date:

11/5/2012

Review:

They are faster. There is a difference, it was like
going from 1st gear to 7th. I consider myself in
shape and swim at least 2 miles a day 5-6 days a
week over a decade. I was out for 4 1/2 hours I
did get used to them. Ill need to adjust my speed
for trolling, I was used to trolling with the small
ones and my Hobie was a fishing machine, now the
speeed is differnt and I only caught one today.

I am with the turbo fins--- I
kayak in the Niagara River
where the current is constant-
- They were quite inpressive
and easy to peddle-- Wish
Hobie would just include these
in the purchase of a new
kayak--

Reviewer:

Flipper

Rating:

5

Date:

9/3/2012

Review:

Got these turbo fins for my
outback. My wife liked
them so much we got to
purchase another set for her
outback. Now we paddle in
harmony again.

Reviewer:

Andy B

Rating:

5

Date:

8/30/2012

Review:

I held off on following the
crowd and swapping out my fins
for a while. I had some
tendonitis from cycling and
didnt want to risk aggravating
the condition in the kayak.
After about 15 months or so
and passing through a stint
with the mid-size fin upgrade
I broke down and bought the
turbos. I LOVE THEM. They have
not bothered my knees, and
were not significantly more
difficult to pedal than the
already upgraded fins I was
using. They are very different
though. With the two smaller
sizes of fins, you have to
pump faster to go faster, but
it is like riding in 2nd gear.
You simply set the pace by how
much you exert yourself. With
the turbos though, I felt like
i had two gears now. Hi and
lo. The first thing you notice
is that you cant use the same
cadence. The pedals feel much
firmer under your feet. So you
pedal slower and more
methodically, while still
maintaining about 2 kts. This
is a very relaxed pace once
you are used to the new fins.
Then, if you want to go
faster, you can push a little
harder on the pedals and make
about 3.5 kts, still without
burning yourself out. I
finally feel like I am
covering ground in my Outback.
I used to resign myself to the
fact that a three mile pedal
would take about 45 minutes.
Now, I can maintain about a
3.5 knot pace without really
exerting myself. This should
be a big help in the fall when
the birds and Albies are on
the sand eels in NJ! I highly
recommend the turbo fins once
your body an conditioning are
ready.

Reviewer:

gk

Rating:

3

Date:

8/30/2012

Review:

The kit is by Hobie and is good
quality. The removal of the old
threaded masts which were only used
twice was difficult. The increase in
speed with the Turbo fins is not
impressive. The removal of the old
masts required the use of vise grip
pliers.

Reviewer:

Mike Schrag

Rating:

5

Date:

8/30/2012

Review:

Turbo fins worked great... I
noticed the difference in
speed immediately. Of course
they work you a bit harder but
well worth it. Install was
simple. Too bad theyre not an
option when purchasing the
kayaks but still worth the
extra $.

Reviewer:

canvas guy

Rating:

4

Date:

8/1/2012

Review:

I was pleased with the upgrade
performance. Put the shaft
through the lower part of the
fins on initial trip. Quick
fix from the web site.
Understand this will be the
nature of the beast and worth
the trade off.

Reviewer:

MJM

Rating:

5

Date:

5/23/2012

Review:

Both ACK and the turbo fins
get five stars. Dont
even think about it, they are
a great upgrade. I
honestly couldnt tell that
they were harder to
pedal, but they certainly make
the kayak move!

Reviewer:

DF

Rating:

5

Date:

4/30/2012

Review:

ACK was very easy to deal
with. If you dont have the
turbo fins you need to get
them. I cant really figure out
why Hobie doesnt make these
standard. If you want easier
pedaling just pedal easy. The
kayak will still go faster
than with the same effort with
standard fins.

Reviewer:

skunk factory

Rating:

5

Date:

3/30/2012

Review:

my old fins were a little bent
and chewed up. replacing them
made a big difference. easy
install

Reviewer:

scubadiver400

Rating:

5

Date:

1/14/2012

Review:

They definitely make your
Kayak move a lot faster than
the regular fins. It's
definitely a huge plus and if
you add the Larger rudder, you
will have a lot more control
of your kayak.

Reviewer:

Terry McClain

Rating:

5

Date:

9/17/2011

Review:

I must if you have a Hobie
Adventure with the
standard fins. Huge increase
in speed and distance.
Add a larger rudder to your
order and the
combination for the Adventure
makes a noticeable
difference in the performance
of the model.

Reviewer:

Gtron3030

Rating:

5

Date:

8/26/2011

Review:

impressive increase in speed.

Reviewer:

Tonyb

Rating:

5

Date:

7/29/2011

Review:

This is a great performance
enhancer and easy to install.

Reviewer:

MJZ

Rating:

4

Date:

7/28/2011

Review:

Great improvment in speed and
response.
Great marketing on Hobies
part. Way overpriced.
They have a nich and they are
taking advantage.
This upgrade along with the
larger rudder has improved
sailing performance greatly.

Reviewer:

RobertD

Rating:

5

Date:

7/13/2011

Review:

The turbo fin is really easy to
replace. Just unhook the pin and
slip the new one one. ACK is
great with customer service and
shipping is fast.

Reviewer:

Gary F

Rating:

5

Date:

5/4/2011

Review:

Wow! What a performance improvement. Easy to install and worth the price. No regrets here only smiles and miles.

Reviewer:

nstarjavman

Rating:

5

Date:

4/25/2011

Review:

Easy install, provide good power, easily held 4.5
knots into a 30 knot headwind using these fins.

Reviewer:

atch71

Rating:

5

Date:

2/13/2011

Review:

Needed a spare set. Nobody in my area, including my Hobie dealer carries much stock. ACK had it and shipped it right away. Plus, "Cali" got screwed out of their stinkin' tax! I win! ACK wins!

Reviewer:

Julie

Rating:

5

Date:

2/3/2011

Review:

This was easy to put on, and wonderful difference in use. I'm a small woman and was worried about the additional energy output, but it is hardly noticed for a nice difference in speed. Highly recommended!

Reviewer:

Gary

Rating:

5

Date:

1/20/2011

Review:

Good price, great product, free shipping!

Reviewer:

william hutto

Rating:

1

Date:

12/1/2010

Review:

One stainless post had a flat place for a wrench and one did not. Neither had the ends grooved for a screw driver like the original ones. The originals were so hard to get out that the brass nut turned inside the rubber. It would have been fun to change these out in the field without a pipe wrench handy. score...0

Reviewer:

JC

Rating:

5

Date:

11/18/2010

Review:

Turbo Fin adds a lot more thrust providing more power against currents, good for leg/cardio workout.

Reviewer:

Naples Man

Rating:

4

Date:

11/8/2010

Review:

One try and you are hooked, you won't want to go back to the standard fins. This set was for our second boat - it was no fun cruising with mismatched boats, the non-turbo boat could never keep up. Watch the shallows, and I've heard if you are too aggressive with them they can tear, but I've not had any problems.

Reviewer:

Holmes

Rating:

5

Date:

10/3/2010

Review:

The turbo fins are a must have. Good resistance and exercise. I highly recommend purchasing especially if you want to cover some distance.

Reviewer:

R.Williams

Rating:

4

Date:

9/30/2010

Review:

Didn't want to spend the money right after buying my boat but I had tried them on another boat and was impressed.They work great with less effort.I think they should come standard on Hobies as the boat itself is very expensive.

Reviewer:

Water Boy

Rating:

5

Date:

9/23/2010

Review:

Great product. Gives the legs a better workout because of more resistance. Better starts and cruising speeds. Watch out for the shallows more.

Reviewer:

randy

Rating:

5

Date:

9/13/2010

Review:

I thought it was fast before, but with these upgraded fins, it is much faster. Easy installation.

Reviewer:

Brad

Rating:

5

Date:

8/26/2010

Review:

Complete kit, easy to install and the fins make a noticeable difference when on the water. ACK offered the best deal after comparing price + shipping. Since I have done business with then before it was a pleasure to make another purchase. Great company with great products.

Reviewer:

Lake Mom

Rating:

5

Date:

8/26/2010

Review:

Worth the little bit extra $ to go fast!!!

Reviewer:

Oceanrez

Rating:

5

Date:

8/20/2010

Review:

The ST Turbo fins turn the Hobie Adventure Island into a different boat. Moving the boat is easier and faster. Powering through tacks or just picking up some extra speed in low winds with t he new fins is a breeze. Installation was a snap. Just follow the video.

Reviewer:

John Hayward

Rating:

4

Date:

8/15/2010

Review:

We got the Hobie Mirage Turbo Fins with our boat and they do provide great power. I can't compare them to the standard since I had ACK install them when I bought the kayak. However they do increase the draft of the kayak and that can limit you a little if you like to explore tidal marches as we do.

Reviewer:

Chris V

Rating:

5

Date:

7/14/2010

Review:

The best. Using the standard fins really sucks after using these.

Reviewer:

jim k.

Rating:

5

Date:

7/10/2010

Review:

excellent product.it is the only fins i have used.when i rec'd hobie mirage i ordered them right away.never used originals.

Reviewer:

James O

Rating:

5

Date:

7/7/2010

Review:

Have been using the Turbo fins on my kayak for over a year and my wife finally said she wanted to be upgraded as well. Your site was easy to navigate and your service(delivery)was great. My wife is very happy with her upgrade. Thanks to you all.

Reviewer:

donnadrury

Rating:

4

Date:

6/11/2010

Review:

The turbo fins are especially necessary if you want to sail your kayak (they act as center boards of a sail boat). The speed of pedaling is faster. I don't notice much difference in effort required to pedal. Perhaps that is because I followed the advice given on the Hobie forum (http://www.hobiecat.com/community/viewtopic.php?f=11&t=10176&hilit=adjusting+turbo+fins) to keep the tension loose in the fins (by adjusting the screw at the top left corner of the fin). Using this technique, you get speed without a lot of extra effort.

Reviewer:

Casey

Rating:

5

Date:

6/10/2010

Review:

I can't imagine not having these. I felt like I was peddling in place with the stock fins.

Reviewer:

TMNaples

Rating:

5

Date:

5/6/2010

Review:

They are outstanding! I am able to troll @ 3.5-4.5 with ease.

Reviewer:

mmk

Rating:

3

Date:

4/8/2010

Review:

I bought these fins as an upgrade on my Outback, however I'm still deciding whether I really like them better than the original fins. They definitely give you more speed,..however it comes with a noticeable increase in effort required to move the pedals now. Not that it's become a real strain, but I used to be able to cruise at slow speed with almost no pedaling effort and now I find myself thinking about it more! One place where they are definitely nice however, is when you need to move against moderate wind & current!

Reviewer:

DaveDUtah

Rating:

5

Date:

4/1/2010

Review:

With the original fins, it felt like riding a mountain bike around in first gear. The turbo fins provide a much better feel to the pedals. If anything, they might still be a little underpowered--but at least they still fit in the mirage drive bag.
I bought them because I got the sail kit, but I would strongly recommend them for any man. Petite women and children may prefer the smaller fins, but I doubt it.

These Mirage Turbo Fins provide the perfect blend of effort and speed!

Reviewer:

Pablo

Rating:

5

Date:

9/19/2009

Review:

Very happy with products and the online experience

Reviewer:

Microboater

Rating:

5

Date:

9/2/2009

Review:

These will work your legs more, but give you a higher potential for maximum power application. You will probably adopt a slower pedaling cadence with these, like using a higher gear on a bicycle. If your legs are tired or your knees sore, you might occasionally find yourself wishing to have the easy, "low-geared" pedaling with the stock fins, but in general you won't regret using Turbos once you are accustomed to them.

Reviewer:

Bill F

Rating:

5

Date:

8/17/2009

Review:

The Hobie Mirage Turbo Fin Kit is an excellent product. I agree with other users that these fins should be the standard issue on the Hobie Adventure kayak since it's primary design and use is speed and performance. I love the kick that you get with these fins over the smaller standard ones. If in doubt about buying them...buy them. You will not be disappointed!! Also I can't say enough about Austin Kayak as the best online source I have found for kayak accessories. Best prices, discounts, delivery and no tax to me. Keep up the excellent work!

Reviewer:

Tom

Rating:

5

Date:

7/10/2009

Review:

After reading other reviews I bought the Turbo fin kit for my Adventure Island. I was very happy with the increased speed when helping during a tack turn. I was also surprised that the Turbo fins seemed to help with up-wind sailing. I was so pleased that I ordered a set of Turbo fins for our Outback SUV. Well worth the price!

Reviewer:

Desmo

Rating:

5

Date:

7/6/2009

Review:

Like having another gear. Both speed and difficulty increase allowing a more cardio type workout. Easy installation in less than 15 minutes. Also found lock nuts loosened and will try lock-tite idea.

Reviewer:

Gary

Rating:

5

Date:

6/28/2009

Review:

You won't be disappointed when you add these fins to your kayak. Yes, it is a little harder to peddle, but you can go faster with very little effort.I do recommend checking all set screws and nut after each outing.The extra torque will loosen them up,so make sure you use lock tight on them. Enjoy your new fins! I do!

Reviewer:

Maine guide

Rating:

5

Date:

6/18/2009

Review:

there is a reason why this product has more 5 star reviews, than any other on the ACK website. it doesn't just increase the you speed, also your efficiency by allowing you to peddle at a slower rate while still maintaining a good headway.

Reviewer:

Ed

Rating:

5

Date:

5/31/2009

Review:

Super item, makes a huge difference when compared to the basic fins. Austin Kayak is superb when it comes to pricing and customer satisfaction.

Reviewer:

Ed

Rating:

5

Date:

4/9/2009

Review:

This is the best addition I've made to my kayak so far.The difference in pedaling and speed is unbelievable and I strongly recommend anyone whose thinking about making this change to go ahead and do it!

Reviewer:

aussie pete

Rating:

5

Date:

2/6/2009

Review:

These fins are the go!!

Reviewer:

Bruce

Rating:

5

Date:

10/15/2008

Review:

This is fantastic, and it is even adjustable for effort! This should be the only fin. My average speed is up 1/2 to 3/4 knot and I experience less fatigue because of the lower recycle rate of the
muscles.

Reviewer:

jpd

Rating:

5

Date:

9/12/2008

Review:

Works great, now bring on a SUPER turbo FIN taking YET more effort for a really good on the water workout. A stair stepper on water.

Reviewer:

Dennis

Rating:

5

Date:

8/18/2008

Review:

This is a great accessory for the kayak and its makes it faster and great work out..

Reviewer:

kaleo

Rating:

5

Date:

8/16/2008

Review:

Now, I can comfortably cruise at 3.8 to 4.2mph on a calm lake. It is a hoot to pass paddle tandems, challenge them to a quarter-mile race, and then leave them far behind in my wake. Again, Hobie should make this the standard propulsion unit.

Reviewer:

Richard

Rating:

5

Date:

8/8/2008

Review:

These were great for getting more speed. They give a little more resistance on the pedals, but make up for it by not having to pedal as fast. I'm very happy with them.

Reviewer:

OW

Rating:

5

Date:

7/30/2008

Review:

I bought two sets of these fins for a Hobie outfitter tandem, and used ACKs discount code in their newsletter. I couldn't be happier
with them. The turbo fins slow down the cadence required to maintain a decent clip, which I find more comfortable than the stock fins.

Reviewer:

PM

Rating:

5

Date:

7/16/2008

Review:

A little pricey but a must for the mirage drive. Hobie should use these as stock fins. Increased speed with much slower cadence. It is like being in the correct gear on your bike rather than stuck in low gear.

Reviewer:

Dave

Rating:

5

Date:

7/1/2008

Review:

After changing one set of fins to the Turbo Fins on my tandem, I took the yak out solo with both Mirage Drives to test the fins. The turbo fins moved faster through the water with less peddling. Great improvement over the stock fins, now I just need a second set for the front!

Reviewer:

Ed Mc

Rating:

5

Date:

6/28/2008

Review:

If you are on the fence about these go for it!
The way the mirage drive should come as standard.
Very little extra effort compared to stock nice increase in speed.

Reviewer:

TaosWheat

Rating:

5

Date:

5/7/2008

Review:

I installed my Turbo kit before putting my Outback in the water, so I can't compare the Turbo to normal fins. What I can say, is that I have no problem pedaling the yak with the Turbo fins and I can easily maintain 2.5 to 3 mph with relatively little effort. They must work.

Reviewer:

kayakaventura

Rating:

5

Date:

4/26/2008

Review:

EXCELLENT!

Reviewer:

Marco

Rating:

5

Date:

4/17/2008

Review:

One of the best upgrades I have done for my Hobie revolution. I almost think Hobie should send the mirage drives that way from the factory.

Reviewer:

business1broker

Rating:

5

Date:

12/15/2007

Review:

Like a higher gear on a bike, makes pedaling more efficient if you prefer strength over repetition. Tad pricey.

Reviewer:

Ron of Kingsland,Ga.

Rating:

5

Date:

8/17/2007

Review:

Great extra power against the incoming and out going tides!!! Just a bit more noisy than the original size... Well recommended for tidal flows and long trips.

Reviewer:

J in Washington

Rating:

5

Date:

8/3/2007

Review:

The turbo fin is incredible! It increase my peddling speed from about 2.2mph to about 3.8mph, while keeping my cadence at a very comfortable pace. I can go much faster if I peddle faster! There is more resistance with the turbo fin. But I equate it to going slightly downhill on a bike using the med chain ring (turbo fins) vs the small chain ring (reg fins!). You go a lot farther with every stroke!

I let my 2 friends try it, and they each purchased one the next

Reviewer:

Bill H

Rating:

5

Date:

7/25/2007

Review:

Increased speed .5 to .75 mph with same cadence as std fins on Revo. A little extra effort required, but you get used to it quickly. At slow speeds (2-2.5 mph) it is effortless. Well worth the expense.

Reviewer:

Damien

Rating:

5

Date:

6/11/2007

Review:

They do exactly what the say and they do it very well. The pressure it takes to peddle compared to the originals is substantial but not to tough. We can now maintain a 1 mph average increase in cruising speed.
If you are on the fence, get them they are great!